37 results about "Ion-association" patented technology

The invention relates to a method for preparing high-transition metal content molecular sieves. In the invention, Ni-ZSM-5, Co-ZSM-5 and Cu-ZSM-5 molecular sieves the transition metal contents of which respectively reach up to 15% are successfully designed and synthetized by taking ion association formed by the interaction of the traditional template agent and the metal complex as a template agent for synthetizing the molecular sieves and directly introducing metal ions to the skeletons of the molecular sieves by the template agent. The high-transition metal content heteroatom molecular sieve material has regular crystal structure, uniform bore diameter, bigger specific surface area and pore volume as well as good thermostability and hydrothermal stability.

The invention relates to a method for preparing a high-content double-transition metal heteroatom composite molecular sieve. By using a stepwise synthesis method, a a MFI primary structure is firstly synthesized; then a M1-MFI molecular sieve is taken as part of silicon sources wherein M1 is one or two selected from the group consisting of Ni, Co, Cu, Fe, Zn, Cr and the like; M1-MFI is introduced into the hole wall of a mesoporous M2-MCM-41 molecular sieve wherein M2 is one or two selected from the group consisting of Ni, Co, Cu, Fe, Zn, Cr and the like; amorphous substances are guided to arrange in order to change defects of amorphous hole wall of the mesoporous molecular sieve, increase the wall thickness and raise heat stability and hydro-thermal stability of the mesoporous M2-MCM-41 molecular sieve. In the mean time, ion association complex formed by the interaction between a traditional template and a metal coordination compound is taken as a template of the synthesis molecular sieve, and metal ion is directly introduced into the molecular sieve skeleton through the template, successfully designing and synthesizing the double-transition metal heteroatom composite molecular sieve. The above composite molecular sieve material has well-regulated crystal structure, high metal content, two uniform mesoporous apertures, large specific surface area and pore volume, and good heat stability and hydro-thermal stability.

The invention relates to a method for measuring perfluorooctane sulfonate by using dual-wavelength ratio ultraviolet spectroscopy, and belongs to the field of physical and chemical inspection research. Perfluorooctane sulfonate molecules do not have ultraviolet absorption functional groups and do not have ultraviolet absorption properties. In the method provided by the invention, the ultraviolet absorption generates electrostatic interaction with toluidine blue under acidic conditions to form an ionic associate, the ionic associate shows two characteristic peaks at 632 nm and 502 nm and performs rational absorption, the concentration of a perfluorooctane sulfonate solution has a good linear relationship with an ultraviolet dual-wavelength absorption ratio value under selected conditions, and the dual-wavelength ratio ultraviolet spectroscopy for measuring the perfluorooctane sulfonate is established accordingly. The method provided by the invention is suitable for measuring the perfluorooctane sulfonate in environmental water samples, and has the advantages of simple and convenient operation, high sensitivity, strong anti-interference ability and the like.

The invention discloses a method for preventing WLAN (Wireless Local Area Network) association-breaking attack based on prime factorization verification, and belongs to the technical field of communication. The method comprises the following steps that: a STA (Station) transmits an association request frame carrying a generated large composite number; an AP (Access Point) receives the associationrequest frame; the AP transmits an association response frame carrying the generated large composite number; the STA receives the association response frame; the STA transmits a breaking authentication association frame carrying a large prime number; the AP receives the breaking authentication association frame and verifies the large prime number in the breaking authentication association frame; the AP transmits the breaking authentication association frame carrying the large prime number; and the STA receives the breaking authentication association frame and verifies the large prime number inthe breaking authentication association frame. The STA and the AP generate the large prime number and the large composite number which are required during association breaking of the other party at an association stage, and the transmission of the large composite and the large prime number is realized through a frame extension field. Frame reception is authenticated at a breaking stage, so that the STA and the AP are protected from being disconnected exceptionally due to an association-breaking authentication frame transmitted by a malicious third party. Through adoption of the method, the security, protocol compatibility and authentication success rate are improved greatly.

The invention discloses a preparation method of a thickening agent copolymerization association compound. The copolymerization association compound contains a structural unit A, a structural unit B and a structural unit C, the structural unit A is acrylamide, the structural unit B is amphoteric monomer N-methyldiallyl propanesulfonate (MAPS), and the structural unit C is an ion association body of the structural unit B and cationic polyamine; and based on the total amount of the copolymerization association compound, the content of the structural unit A is 10-75wt%, the total content of the amphoteric monomer is 8-55wt%, and the content of the cationic polyamine is 1-50wt%. Temperature resistance of the thickening agent prepared by the method can reach 200 DEG C, anti-NaCl concentration is saturated, and the anti-CaCl2 concentration reaches 20%; and meanwhile, excellent shale inhibition performance and filtrate loss controllability are furthermore achieved.

The invention discloses a high-precision urine iodine detection method which comprises the following steps: by taking N-bromosuccinimide as an oxidizing agent, oxidizing iodide ions in urine into iodate ions, introducing tetrabutylammonium iodide to react with the iodate ions, and forming an ion association compound by utilizing the electrostatic attraction effect between tetrabutylammonium cations and triiodide anions; and the ionic association compound is subjected to extraction and absorbance detection to establish a linear relationship between the iodine ion concentration and absorbance, thereby implementing high-precision detection on urine iodine. By means of the mode, the urine iodine can be safely and conveniently subjected to high-precision detection, the detection method is simple, convenient and easy to implement, high in detection speed and low in detection cost, the detection process has high sensitivity, precision and accuracy, high-precision detection of the urine iodinecan be achieved, the requirements of practical application can be met, and high application value is achieved.

An electrolytic solution for electrochemical elements which comprises an anion ingredient having one or more fluorine atoms and a cation ingredient which is imidazolium or an imidazolium derivative each having one or more hydrogen atoms, and which has at least five fluorine atom / hydrogen atom pairs in each of which the distance between the fluorine atom of the anion ingredient and the hydrogen atom of the cation ingredient is 2.7 Å or shorter. For example, the ionic association compound (I) shown below has been formed in the solution. This electrolytic imidazolium solution shows a higher withstand voltage than conventional electrolytic solutions containing 1,3,4,5-tetramethylimidazolium.

The invention relates to a method for accurately determining chitosan content by a resonance Rayleigh scattering method and belongs to the field of macromolecular substance detection. The method solves the problem that in the prior art the chitosan content of a finished product is difficult to determine and processes are complex. The method utilizes the characteristic of chitosan reacting with Allura Red under weakly acidic conditions to produce an association complex, and comprises measuring the RRS intensity IRRS of the ion association complex and the RRS intensity I0RRS of the reagent blankat the maximum RRS wavelength, calculating delta IRRS according to a formula of delta IRRS=IRRS-I0RRS, building standard curves of delta I and different molecular weight chitosan concentrations, selecting the standard curve according to the chitosan molecular weight in the sample, and calculating the chitosan content of the sample according to the delta IRRS of the detected sample. The method hasthe advantages of cheap reagents, high sensitivity and good reproducibility, and is suitable for promotion and application in practical applications.

The invention relates to a preparation method of antistatic agent onium salt fluoride, which comprises the following steps: (1) adopting tap water as a solvent and carrying out ion association reaction on perfluorobutane metal sulfonate and halogenated tetrabutyl onium salt at a temperature of 60-80 DEG C; standing and layering, and decantating an upper layer of water-containing material; obtaining a lower layer of liquid phase which is insoluble in water; (2) washing the lower layer of liquid phase by using tap water with the same volume as the lower layer of liquid phase at a temperature of 60-80 DEG C for 1-2 times; (3) adsorbing inorganic ions in the lower layer of liquid phase by using ion exchange resin; dissolving the lower layer of liquid phase by using methanol, adding strongly-acidic type styrene cation exchange resin of which the crosslinking degree is 25 percent, agitating and filtering; and then adding strongly-basic type crylic acid type anion exchange resin with strong water absorption, agitating and filtering; (4) steaming out methanol to obtain the onium salt fluoride of which foreign ions reach the standards. The preparation method has the advantages of simple process, energy conservation, emission reduction, high yield and the like.

The invention relates to a method for accurately measuring the content of chitosan oligosaccharide according to a resonance rayleigh scattering method, and belongs to the field of macromolecule detection. The chitosan oligosaccharide and rubylith are combined to form ionic associate under the certain condition, then the resonance scattering strength is obviously increased, and lauryl sodium sulfate serving as a sensitizer is added to improve the sensitivity. The resonance scattering strength and the chitosan oligosaccharide form a linear relation within certain concentration range, the linearrelation is taken as a quantitative basis of the chitosan oligosaccharide, and the resonance rayleigh scattering method for measuring the chitosan oligosaccharide is established. The measurement of the method is affected by the ionic concentration and the interferent, a standard product with the ionic concentration controlled to 0.05 mol / L to 0.20 mol / L is taken as a quantitative standard in the actual measurement of a sample, and the method has the advantages of cheap agents, high sensitivity, good repeatability, simplicity and convenience in operation, and the like.

The invention relates to agent for rapidly detecting the snail-killing agent of niclosamide on site, belonging to the technical field of the chemical agent preparing method. The agent for rapidly detecing the snail-killing agent of niclosamide on site comprises inorganic alkali, organic alkaline solvent, high-stability calcium and magnesium chelating agent and water. Because the anions of the niclosamide and the cations of the base-radical are combined into ion-association complex, the conjugate structure of the niclosamide molecule can be expanded, the effective light absorption area can be enlarged, the maximum light absorption peak can be subjected to the redshift, the molar light absorption coefficient can be magnified and the visible spectrophotometry and even the visual analysis of the niclosamide can be realized. The application dosage of the niclosamide can be rapidly detected on site with the direct spectrophotometry.

The invention discloses a temperature-resistant thickening agent copolymerization association compound and a preparation method thereof. The copolymerization association compound contains a structural unit A, a structural unit B and a structural unit C, the structural unit A is N,N-dimethylacrylamide, the structural unit B is an amphoteric monomer methacryloyloxyethyl-N,N-dimethylpropanesulfonate (DMAPS), and the structural unit C is an ion association body of the structural unit B and cationic polyamine; and based on the total amount of the copolymerization association compound, the content of the N,N-dimethylacrylamide is 10-75% by weight, preferably 30-65% by weight, the total content of the amphoteric monomer is 8-55% by weight, preferably 20-60% by weight, and the content of the cationic polyamine is 1-50% by weight, preferably 3-40% by weight. Temperature resistance of the thickening agent prepared by the method can reach 150 DEG C, anti-NaCl concentration is saturated, and anti-CaCl2 concentration reaches 20%; and meanwhile, excellent shale inhibition performance and filtrate loss controllability are furthermore achieved.

An aqueous composition for pretreating and depositing a coating on metal substrates is provided. The coating composition includes from about 1,500 to about 55,000 ppm based on the aqueous composition of a Group IIA dissolved metal ion, from about 100 to about 200,000 ppm based on the aqueous composition of a dissolved complex metal fluoride ion wherein the metal atom is selected from Group IIIA, Group IVA, Group IVB metals, Group VA, Group VB metals; and water. The composition is free of Group IIA metal fluoride precipitate achieved by including in the composition a complex metal salt different than the salt associated with the complex metal fluoride ion, with the complex metal salt being capable of complexing free fluoride ions to prevent a precipitation reaction. A process for coating a metal substrate with such an aqueous composition is further provided.

The invention discloses a grafted starch thickening agent copolymerization association compound and a preparation method thereof. The copolymerization association compound contains a structural unit A, a structural unit B, a structural unit C and a structural unit D, the structural unit A is acrylamide, the structural unit B is an amphoteric monomer methacryloyloxyethyl-N,N-dimethylpropanesulfonate (DMAPS), the structural unit C is an ion association body of the structural unit B and cationic polyamine, and the structural unit D is starch; and based on the total amount of the copolymerization association compound, the content of the acrylamide is 6-45wt%, the total content of the amphoteric monomer methacryloyloxyethyl-N,N-dimethylpropanesulfonate is 5-35wt%, the content of the cationic polyamine is 2-30wt%, and the content of the starch is 5-35wt%. Temperature resistance of the thickening agent prepared by the method can reach 150 DEG C, anti-NaCl concentration is saturated, and anti-CaCl2 concentration reaches 20%; and meanwhile, excellent shale inhibition performance and filtrate loss controllability are furthermore achieved.

The invention discloses a starch-containing thickening agent copolymerization association compound and a preparation method thereof. The copolymerization association compound contains a structural unit A, a structural unit B, a structural unit C and a structural unit D, the structural unit A is N,N-dimethylacrylamide, the structural unit B is an amphoteric monomer methacryloyloxyethyl-N,N-dimethylpropanesulfonate (DMAPS), the structural unit C is an ion association body of the structural unit B and cationic polyamine, and the structural unit D is starch; and based on the total amount of the copolymerization association compound, the content of the N,N-dimethylacrylamide is 6-45% by weight, the total content of the amphoteric monomer methacryloyloxyethyl-N,N-dimethylpropanesulfonate is 5-35% by weight, the content of the cationic polyamine is 2-30% by weight, and the content of the starch is 5-35% by weight. Temperature resistance of the thickening agent prepared by the method can reach 150 DEG C, anti-NaCl concentration is saturated, and anti-CaCl2 concentration reaches 20%; and meanwhile, excellent shale inhibition performance and filtrate loss controllability are furthermore achieved.

The invention discloses a temperature-resistant thickening agent copolymerization association compound and a preparation method thereof. The copolymerization association compound contains a structural unit A, a structural unit B and a structural unit C, the structural unit A is N,N-dimethylacrylamide, the structural unit B is an amphoteric monomer methacryloyloxyethyl-N,N-dimethylpropanesulfonate (DMAPS), and the structural unit C is an ion association body of the structural unit B and cationic polyamine; and based on the total amount of the copolymerization association compound, the content of the N,N-dimethylacrylamide is 10-75% by weight, preferably 30-65% by weight, the total content of the amphoteric monomer is 8-55% by weight, preferably 20-60% by weight, and the content of the cationic polyamine is 1-50% by weight, preferably 3-40% by weight. Temperature resistance of the thickening agent prepared by the method can reach 150 DEG C, anti-NaCl concentration is saturated, and anti-CaCl2 concentration reaches 20%; and meanwhile, excellent shale inhibition performance and filtrate loss controllability are furthermore achieved.